<template>
  <div :style="`background:${$attrs.background ? $attrs.background : ''}`" class="header">
    <!--Content before waves-->
    <!-- 主页以及其他页面的波浪 -->
    <!--Waves Container-->
    <div>
      <svg
        class="waves"
        xmlns="http://www.w3.org/2000/svg"
        xmlns:xlink="http://www.w3.org/1999/xlink"
        viewBox="0 24 150 28"
        preserveAspectRatio="none"
        shape-rendering="auto"
      >
        <defs>
          <path id="gentle-wave" d="M-160 44c30 0 58-18 88-18s 58 18 88 18 58-18 88-18 58 18 88 18 v44h-352z" />
        </defs>
        <g class="parallax">
          <use xlink:href="#gentle-wave" x="48" y="0" fill="rgba(255,255,255,0.7)" />
          <use xlink:href="#gentle-wave" x="48" y="3" fill="rgba(255,255,255,0.5)" />
          <use xlink:href="#gentle-wave" x="48" y="5" fill="rgba(255,255,255,0.3)" />
          <use xlink:href="#gentle-wave" x="48" y="7" fill="#fff" />
        </g>
      </svg>
    </div>
  </div>
</template>

<script lang="ts">
import { Vue, Component } from 'nuxt-property-decorator'
@Component({})
export default class BaseWave extends Vue {}
</script>

<style lang="scss" scoped>
.header {
  position: relative;
  text-align: center;
  background: #000;
  color: white;
}

.inner-header {
  height: 10.2vh;
  width: 100%;
  margin: 0;
  padding: 0;
}

.flex {
  /*Flexbox for containers*/
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.waves {
  position: relative;
  width: 100%;
  height: 15vh;
  margin-bottom: -7px; /*Fix for safari gap*/
  min-height: 100px;
  max-height: 150px;
}

.content {
  position: relative;
  height: 20vh;
  text-align: center;
  background-color: white;
}

/* Animation */

.parallax > use {
  animation: move-forever 25s cubic-bezier(0.55, 0.5, 0.45, 0.5) infinite;
}
.parallax > use:nth-child(1) {
  animation-delay: -2s;
  animation-duration: 7s;
}
.parallax > use:nth-child(2) {
  animation-delay: -3s;
  animation-duration: 10s;
}
.parallax > use:nth-child(3) {
  animation-delay: -4s;
  animation-duration: 13s;
}
.parallax > use:nth-child(4) {
  animation-delay: -5s;
  animation-duration: 20s;
}
@keyframes move-forever {
  0% {
    transform: translate3d(-90px, 0, 0);
  }
  100% {
    transform: translate3d(85px, 0, 0);
  }
}
/*Shrinking for mobile*/
@media (max-width: 768px) {
  .waves {
    height: 40px;
    min-height: 40px;
  }
  .content {
    height: 30vh;
  }
  h1 {
    font-size: 60px;
  }
}
</style>
